#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include<string>
using namespace std;
class Solution {
public:
    string minWindow(string s, string t) {
        int hash1[128] = { 0 };
        int hash2[128] = { 0 };
        int kinds = 0;
        for (auto e : t)
        {
            if (hash1[e]++ == 0)
            {
                kinds++;
            }
        }
        int len = INT_MAX;
        int begin = -1;
        for (int left = 0, right = 0, count = 0; right < s.size(); right++)
        {
            char in = s[right];
            if (++hash2[in] == hash1[in])
                count++;
            while (count == kinds)
            {
                if (right - left + 1 < len)
                {
                    len = right - left + 1;
                    begin = left;
                }
                char out = s[left++];
                if (hash2[out]-- == hash1[out])
                {
                    count--;
                }
            }
        }
        if (begin == -1)
            return "";
        else
            return s.substr(begin, len);
    }
};